18661382315 has 8 divisors (see below), whose sum is σ = 22398005520. Its totient is φ = 14926208032.

The previous prime is 18661382297. The next prime is 18661382357. The reversal of 18661382315 is 51328316681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18661382315 - 2²⁰ = 18660333739 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333689 + ... + 385578.

It is an arithmetic number, because the mean of its divisors is an integer number (2799750690).

Almost surely, 2^18661382315 is an apocalyptic number.

18661382315 is a deficient number, since it is larger than the sum of its proper divisors (3736623205).

18661382315 is an equidigital number, since it uses as much as digits as its factorization.

18661382315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724461.

The product of its digits is 207360, while the sum is 44.

Adding to 18661382315 its reverse (51328316681), we get a palindrome (69989698996).

The spelling of 18661382315 in words is "eighteen billion, six hundred sixty-one million, three hundred eighty-two thousand, three hundred fifteen".